Infrared spectra of adsorbed molecules on thin silica films

Abstract

Using a thin film of silica deposited on a ZnSe window we have been able to observe, after spectral subtraction, the i.r. spectra due to the SiOSi, SiOti, and SiOGa stretching modes when surface hydroxy groups react with (Me₃Si)₂NH, TiCl₄, or GaMe₃ respectively; this versatile technique permits rapid acquisition of i.r. spectral data, over a wide range of temperature or pressure, in regions where an oxide is strongly absorbing.